Instructables

Step 5: Join the Two Sides as One.

Picture of Join the Two Sides as One.
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In this step, the idea is to create a 'spine' or a kind of backbone made of normal tape or masking tape, just follow the images below. Once the spine is created, use duct tape to cover, if on the front of the mask there would not be a problem covering the middle in tape, then do so. This just stops the mask from falling apart basically.